What is Tdummy doing in (may|does)PointTo?

[Vladimir Panteleev via Digitalmars-d]

On Thursday, 14 April 2016 at 18:47:41 UTC, Andrei Alexandrescu 
wrote:
> https://dlang.org/library/std/exception/may_point_to.html
> https://dlang.org/library/std/exception/does_point_to.html
>
> We have an unfortunate pattern in Phobos: things that start out 
> as simple ideas with nice implementations (in this case 
> pointsTo) slowly change into complicated artifacts with 
> undocumented rationale. We really should rein in documentation, 
> not only external but also internal. In this case I cannot for 
> the life of me figure what Tdummy does, and the only appearance 
> of the name is in the respective definitions.

Generally, if you don't understand why something is there, you 
could...

1. git blame

2. Delete it and see which tests fail :)

In this case it appears to be used to disambiguate between the 
overloaded template.